Tetrahydrofuran → cyclopropyl(1-(4-vinylphenyl)-1H-1,2,4-triazol-5-yl)methanone

HRID 1502762Notes

Reaction equation

HRID 1502762 reaction equation
[CH:1]([C:3]1[CH:8]=[CH:7][C:6]([N:9]2[CH:13]=[N:12][CH:11]=[N:10]2)=[CH:5][CH:4]=1)=[CH2:2].[Li]CCCC.[CH2:19]1[CH2:23][O:22][CH2:21][CH2:20]1>>[CH:19]1([C:23]([C:13]2[N:9]([C:6]3[CH:5]=[CH:4][C:3]([CH:1]=[CH2:2])=[CH:8][CH:7]=3)[N:10]=[CH:11][N:12]=2)=[O:22])[CH2:20][CH2:21]1

Participants

4

Reactant 3

HCID 8028Tetrahydrofuran2×HCID 585499641-(4-vinylphenyl)-1H-1,2,4-triazoleHCID 178418339Butyllithium

Product 1

HCID 86675220cyclopropyl(1-(4-vinylphenyl)-1H-1,2,4-triazol-5-yl)methanone

Procedure

To a stirred solution of 1-(4-vinyl-phenyl)-1H-[1,2,4]triazole (1 g, 5.8 mmol) in 25 mL of THF, was added n-BuLi (0.37 g, 5.8 mmol) at −78° C. and stirred for 30 min. To this N-methoxy N-methylcyclopropoxide in THF (0.82 g, 6.4 mmol) was added and the resultant reaction mixture was stirred at ambient temperature for 16 h. The reaction mixture was quenched with a saturated aqueous NH4Cl solution and extracted with EtOAc (3×25 mL). The combined EtOAc layer was washed with brine and dried over sodium sulphate and concentrated under reduced pressure. The crude compound was purified by flash chromatography (SiO2, 100-200 mesh, 40% EtOAc in Pet ether) to afford the title compound as an off white solid (420 mg, 30%): mp 90-91° C.; 1H NMR (400 MHz, CDCl3) δ 8.12 (s, 1H), 7.50 (d, J=7.8 Hz, 2H), 7.38 (d, J=7.8 Hz, 2H), 6.75 (dd, J=16.3, 10.7 Hz, 1H), 5.81 (d, J=16.3 Hz, 1H), 5.35 (d, J=10.7 Hz, 1H), 3.22 (m, 1H), 1.27 (m, 2H), 1.18 (m, 2H); ESIMS m/z 240.18 ([M+H]+); IR (thin film) 2922, 1630 cm−1.

Workup

  1. customthe resultant reaction mixture
  2. stirringwas stirred at ambient temperature for 16 h
  3. customThe reaction mixture was quenched with a saturated aqueous NH4Cl solution
  4. extractionextracted with EtOAc (3×25 mL)
  5. washThe combined EtOAc layer was washed with brine
  6. dry with materialdried over sodium sulphate
  7. concentrationconcentrated under reduced pressure
  8. customThe crude compound was purified by flash chromatography (SiO2, 100-200 mesh, 40% EtOAc in Pet ether)

Sources & evidence

ORD record
ord-7c5d6ffd3de14723b6c3cc04d04a7a2f
Source dataset
uspto-grants-2015_12
Patent number
US09210927B2

Reaction notes

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